Photo-induced anomalous Hall effect in ferromagnetic (Co)/transition metal dichalcogenide (WS 2 ) heterostructure

Abstract

Abstract The photo-induced Hall effect is shown in the Co/WS2 heterostructure. This heterostructure consists of a ferromagnetic metal layer that forms a Schottky junction to a transition metal dichalcogenide semiconductor layer. In this effect, under the magnetic field and light irradiation, the excited charge carriers from the WS2 layer diffuse into the Co layer and are driven by Lorentz forces, then creates a transverse voltage in the open circuit. This open circuit voltage is a function of light and magnetic field intensity. The photo-induced voltage is nonlinear and hysteretic with the applied magnetic field and is in good agreement with magneto-optical Kerr's hysteresis loops. The observed results can provide a new technique for optical and magnetic sensing applications. In addition, it proposed a new technique to reconstruct the in-plane magnetic hysteresis loop for metallic thin films.